Oconomowoc ( ə-KON-ə-mə-wok) is a city in Waukesha County, Wisconsin, United States. The name was derived from Coo-no-mo-wauk, the Potawatomi term for "waterfall." The population was 15,712 at the 2010 census. The city is partially adjacent to the Town of Oconomowoc and near the village of Oconomowoc Lake, Wisconsin.
Before 1700, this region was inhabited by Potawatomi peoples descended from Woodland Indians known as "mound builders". There are also reports that the Sauk Indian chief Black Hawk had a campsite on Oconomowoc Lake.
The first white person recorded in the area was Amable (sometimes spelled "Aumable") Vicau, brother-in-law of Solomon Juneau, one of the founders of Milwaukee. Vicau established a trading post in 1827. White settlers soon followed, beginning in 1830.
In April 1837, New York native Charles Sheldon staked a 160-acre claim on the eastern shore of what is now Fowler Lake, registering it with the Land Bank of Milwaukee on April 21, 1837. A few days later, H.W. Blanchard acquired a claim adjacent to that of Sheldon on the other side of the lake, which he later sold off to Philo Brewer. Brewer constructed what some consider to be the first residence within Oconomowoc's current legal limits, a site located at what is now 517 N. Lake Road, between La Belle and Fowler lakes.